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HK1016369A1 - Robust method and apparatus enabling multi-mode wireless optical communication - Google Patents

Robust method and apparatus enabling multi-mode wireless optical communication

Info

Publication number
HK1016369A1
HK1016369A1 HK99101354A HK99101354A HK1016369A1 HK 1016369 A1 HK1016369 A1 HK 1016369A1 HK 99101354 A HK99101354 A HK 99101354A HK 99101354 A HK99101354 A HK 99101354A HK 1016369 A1 HK1016369 A1 HK 1016369A1
Authority
HK
Hong Kong
Prior art keywords
control field
stations
synchronization
robust
optical communication
Prior art date
Application number
HK99101354A
Inventor
Martin De Lange
Fritz Rudolf Gfeller
Walter Hirt
Original Assignee
Ibm
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ibm filed Critical Ibm
Publication of HK1016369A1 publication Critical patent/HK1016369A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/04—Speed or phase control by synchronisation signals
    • H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal
    • H04L7/042—Detectors therefor, e.g. correlators, state machines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/1141—One-way transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/1149—Arrangements for indoor wireless networking of information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0025—Transmission of mode-switching indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/04—Speed or phase control by synchronisation signals
    • H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal
    • H04L7/046—Speed or phase control by synchronisation signals using special codes as synchronising signal using a dotting sequence
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Quality & Reliability (AREA)
  • Computing Systems (AREA)
  • Optical Communication System (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Small-Scale Networks (AREA)

Abstract

The communication system includes a robust physical layer header (RPLH) which can be understood by all participating stations. This robust header (50) at least comprises a preamble (52) consisting of frames forming a periodic sequence of pulses, the number of slots per frame and the frame content being known to all participating stations. The preamble serves for relative synchronization and carrier detection of the receiving stations. The robust header further comprises a unique synchronization word (53) which is used for absolute synchronization of the receiving stations. This synchronization word is followed by a control field (59) of fixed length and known structure. The control field informs the receiving stations of which modulation method will be used for the transmission of data. Pref. the control field also includes data for communication link and network control.
HK99101354A 1996-01-03 1999-04-07 Robust method and apparatus enabling multi-mode wireless optical communication HK1016369A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CNB961995165A CN1297085C (en) 1996-01-03 1996-01-03 Robust method and apparatus enabling multi-mode wireless optical communication
PCT/IB1996/000002 WO1997025788A1 (en) 1996-01-03 1996-01-03 Robust method and apparatus enabling multi-mode wireless optical communication
CA002241937A CA2241937C (en) 1996-01-03 1996-01-03 Robust method and apparatus enabling multi-mode wireless optical communication

Publications (1)

Publication Number Publication Date
HK1016369A1 true HK1016369A1 (en) 1999-10-29

Family

ID=27170746

Family Applications (1)

Application Number Title Priority Date Filing Date
HK99101354A HK1016369A1 (en) 1996-01-03 1999-04-07 Robust method and apparatus enabling multi-mode wireless optical communication

Country Status (13)

Country Link
US (1) US6442145B1 (en)
EP (1) EP0872049B1 (en)
JP (1) JP3202755B2 (en)
CN (1) CN1297085C (en)
AT (1) ATE239332T1 (en)
CA (1) CA2241937C (en)
CZ (1) CZ204098A3 (en)
DE (1) DE69627886T2 (en)
ES (1) ES2193232T3 (en)
HK (1) HK1016369A1 (en)
HU (1) HUP0001749A3 (en)
PL (1) PL180350B1 (en)
WO (1) WO1997025788A1 (en)

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Also Published As

Publication number Publication date
EP0872049B1 (en) 2003-05-02
CA2241937A1 (en) 1997-07-17
HUP0001749A3 (en) 2002-01-28
PL327574A1 (en) 1998-12-21
JP3202755B2 (en) 2001-08-27
ES2193232T3 (en) 2003-11-01
PL180350B1 (en) 2001-01-31
JPH11502096A (en) 1999-02-16
CN1207220A (en) 1999-02-03
EP0872049A1 (en) 1998-10-21
DE69627886D1 (en) 2003-06-05
CA2241937C (en) 2004-04-27
WO1997025788A1 (en) 1997-07-17
DE69627886T2 (en) 2004-05-19
US6442145B1 (en) 2002-08-27
CN1297085C (en) 2007-01-24
CZ204098A3 (en) 1998-10-14
HUP0001749A2 (en) 2000-09-28
ATE239332T1 (en) 2003-05-15

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Legal Events

Date Code Title Description
PC Patent ceased (i.e. patent has lapsed due to the failure to pay the renewal fee)

Effective date: 20110103